You say you're trying to make your voice more "melodic." Could you elaborate on that a bit more? I mean, you're wanting to hit pitches with more
accuracy, or get better phrasing, or...?
If you're wanting better accuracy, get a keyboard or a piano--at least just access to one--and spend
a good amount of time every day just hitting notes in your range and singing along with them. Then try to sing the notes and hit it on the keys.
Also, what kind of music are you trying to sing? That makes a big difference in your own (and others') perception of your voice. (And if you're
trying to go for rock or blues or something like that, or the folksy singer/songwriter sound, don't worry about your singing voice at all--I cite B.
Dylan, W. Nelson, and K. Cobain
). And keep in mind that some voices just don't match with a style. My fiance is a great classical singer, but
would never make it in the mainstream music world--she just doesn't have the right sound.
There's tons of brilliant singers out there who sound like crap if they sing country, or jazz, or rock, or whatever; in their own realm though,
they're awesome. You might want to try different styles and see if there's one that fits you better--it may not necessarily be the same style you
like to listen to either.
A more appropriate question might be who's your main inspiration as a singer? Not someone that you want to sound exactly like, but someone who has a
similar vocal approach. If you're looking at someone with a lot of technique, say Whitney Houston for example (maybe a bad example, but...) then
you should really consider getting a professional vocal coach. If you want to sing like Bob Dylan or Kurt Cobain, then stop practicing for a couple
of years before your next performance.
Another thing that I've always found to be the biggest stumbling block in singing is confidence. If you worry too much about how you sound, you'll
sound terrible. No matter how bad you are, you'll sound better if you don't care as much (still try, of course); no matter how good you are,
you'll be crap if you just worry about how it sounds. I'm no singer by a long shot, but everyone always confirmed my belief that I sounded a bit
better on karaoke after a couple of beers. Not saying you should drink, but just something to loosen you up and not worry about it. (FWIW, I want to
emphasize "a couple"--after a six pack, I'm the only one who thinks I sound good; more than that and even I can't stand it...)
HTH in some ways. Good luck though